No, you didn't read that wrong. With all the rumours about the 5D Mark IV getting updated video features, the impressive gurus at Magic Lantern have figured out how to get 4K off the 5D Mark III. What's more is they're doing it at a full frame crop. Oh, and it's RAW.
It's still at the experimental stage, and not ready for use yet, but it's impressive that they've been able to do this. It's also kind of embarrassing for Canon that you can get full frame 4K off the older camera and the newer model is limited by a large crop factor (for now). It will be interesting to see how good this looks when it's a bit more stabilised.
Via SLR Lounge